[Freeswitch-users] Bug in Q921.c? AVAYA-PBX issue

[Anthony Minessale]

if you open a jira issue on it we can probably add your patch and/or the
config option.
the users-list is a tough place to manage TDM issues.


On Fri, Dec 12, 2008 at 9:01 AM, Helmut Kuper <helmut.kuper at ewetel.de>wrote:

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> Hash: SHA1
>
> Hello,
>
> I try to establish a ISDN PRI (euroisdn/Q931) link between FS and an
> AVAYA PBX. We use Sangoma A101 and FS revision 10729M on a Ubuntu 8.04
> server in a non-root environment.
>
> We experienced a timer problem which led to this FS console error message:
>
> [ERR] Span:0 Q.921() Failed to establish Q.921 link in 3 retries
>
>
> During anylizing this we found that q921 T203 is never reset when link
> is in state "Multiple Frame Mode Established" and SABME frames are
> received by FS. So it must timeout regardless if SABME frames are
> received or not.
> Additionally we found that the default T203 value (10 sec) was too short
> for AVAYA (it has to be >=19 sec)
>
> To fix the problem we changed two things in q921.c:
>
> Change T203 default value from 10 sec to 20000 sec
> Line 406: trunk->T203Timeout = 20000;
>
> Change Q921T203TimerStart to Q921T203TimerReset to reset T203 on each
> received SABME frame
> Line 1996: Q921T203TimerReset(trunk, tei);
>
> After recompiling FS the Error disapeared. Next week we will do some
> calls over the link to make sure there are no other side effects.
>
> Is it planned to make the q921 timeouts configurable in openzap.conf or
> in openzap.conf.xml?
>
> best regards
> Helmut
>
>
> PS: My openzap configs:
>
> openzap.conf
>
> [span wanpipe PRI_1]
> trunk_type => E1
> b-channel => 1:1-15
> d-channel => 1:16
> b-channel => 1:17-31
>
>
>
>
> openzap.conf.xml
>
> <configuration name="openzap.conf" description="OpenZAP Configuration">
>  <settings>
>    <param name="debug" value="7"/>
>    <!--<param name="hold-music" value="$${moh_uri}"/>-->
>    <!--<param name="enable-analog-option" value="call-swap"/>-->
>    <!--<param name="enable-analog-option" value="3-way"/>-->
>  </settings>
>   <pri_spans>
>     <span name="PRI_1">
>       <!-- Log Levels: none, alert, crit, err, warning, notice, info,
> debug -->
>       <param name="q921loglevel" value="debug"/>
>       <param name="q931loglevel" value="debug"/>
>       <param name="mode" value="user"/>
>       <param name="dialect" value="Oh this is not my dialect"/>
>       <param name="dialplan" value="XML"/>
>       <param name="context" value="default"/>
>     </span>
>   </pri_spans>
> </configuration>
>
> Very interesting here is, that the "dialect" parameter doesn't seem to
> have an effect on FS. I use that one above without any errors or warning
> and I guess that was not intended.
>
>
>
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-- 
Anthony Minessale II

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